Abstract: Conventional sample vessels for mascara are not suitable as sample vessels for cosmetics distributed to users to test the same because of their large number of components and high manufacturing costs. With a disposable mascara brush including a cap filled with a quantity of mascara corresponding to a single or several applications, it is difficult to coat the brush with cosmetics corresponding to a single application. A sample vessel of the present invention includes a cap, a vessel, a vessel body, a vessel thread including female threads formed in the vessel body, a cap thread including male threads meshed with the vessel thread, a coating part connected to the cap thread through a support, a cap body connected to the cap thread and having an opening, a connector installed between the coating part and the support, and a cosmetic quantity adjuster installed in the vessel body.